Magnetic tape and magnetic recording and reproducing device

Active Publication Date: 2019-04-04
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]According to one aspect of the invention, it is possible to provide a magnetic tape suitable for archive use, which is capable of exhibiting excellent electromagnetic conve

Problems solved by technology

For example, as the countermeasure on the head side, an increase in thickness of a protective layer of the head has been considered, but an increase in thickness of the pro

Method used

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  • Magnetic tape and magnetic recording and reproducing device
  • Magnetic tape and magnetic recording and reproducing device
  • Magnetic tape and magnetic recording and reproducing device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0156]A list of each layer forming composition is shown below.

[0157]Preparation of Abrasive Solution

[0158]The amount of 2,3-dihydroxynaphthalene (manufactured by Tokyo Chemical Industry Co., Ltd.) shown in condition C of Table 1, 31.3 parts of a 32% solution (solvent is a mixed solvent of methyl ethyl ketone and toluene) of a polyester polyurethane resin having a SO3Na group as a polar group (UR-4800 (amount of a polar group: 80 meq / kg) manufactured by Toyobo Co., Ltd.), and 570.0 parts of a mixed solution of methyl ethyl ketone and cyclohexanone (mass ratio of 1:1) as a solvent were mixed in 100.0 parts of an oxide abrasive (alumina powder) shown in condition C of Table 1, and dispersed in the presence of zirconia beads (bead diameter: 0.1 mm) by a paint shaker for a period of time shown in condition C of Table 1 (bead dispersion time). After the dispersion, the centrifugal separation process of a dispersion liquid obtained by separating the dispersion liquid from the beads by mesh...

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Abstract

Provided are a magnetic tape, in which a magnetic layer includes a ferromagnetic powder, a binding agent, and an oxide abrasive, ΔSFD in a longitudinal direction of the magnetic tape calculated by Expression 1, ΔSFD=SFD25° C.−SFD−190° C., is equal to or smaller than 0.50, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the magnetic layer is equal to or smaller than 0.050, and an average particle diameter of the oxide abrasive obtained from a secondary ion image obtained by irradiating the surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and a magnetic recording and reproducing device including this magnetic tape.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority under 35 U.S.C 119 to Japanese Patent Application No. 2017-191661 filed on Sep. 29, 2017 and Japanese Patent Application No. 2018-170188 filed on Sep. 12, 2018. Each of the above applications is hereby expressly incorporated by reference, in its entirety, into the present application.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present invention relates to a magnetic tape and a magnetic recording and reproducing device.2. Description of the Related Art[0003]Magnetic recording media are divided into tape-shaped magnetic recording media and disk-shaped magnetic recording media, and tape-shaped magnetic recording media, that is, magnetic tapes are mainly used for data storage. The recording and / or reproducing of information with respect to a magnetic tape is generally performed by bringing a surface of a magnetic tape (surface of magnetic layer) into contact with a magnetic head (hereinafter,...

Claims

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Application Information

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IPC IPC(8): G11B5/008G11B5/706G11B15/473G11B5/39G11B5/48G11B5/735G11B5/84
CPCG11B5/00813G11B5/70678G11B15/473G11B5/39G11B5/48G11B5/735G11B5/8404G11B2220/90
Inventor KASADA, NORIHITOOZAWA, EIKI
Owner FUJIFILM CORP
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